Weatherability
Operating outside means that all the components of the collector must be able to withstand all that Mother Nature delivers, from freezing conditions, to the extreme heat and UV radiation of desert locations.
Apricus collectors are design with this is mind. A good example is the use of silicone rubber instead of plastics for the tube caps, rubber header seals and manifold covers. Silicone rubber is extremely durable, staying flexible in a wide temperature range. It is able to withstand over 200oC / 392oF and is extremely resistance to damage from UV light.